Feeding mechanism for sewing-machines.



J. BERGER, JR.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION men JAN. n. ma.

Patented Apr. 11, 1916.

2 SHEETS-SHEET I.

J. BERGER, Jn.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JAN- II, 1913.

1,178,988. Patented Apr. 11,1916.

2 SHEETS-SHEET 2.

- Jaye/22%;.

n STATES. PATENT onion.

JOSEPH BERGER, JR., OF UTICA, NEW YORK, ASSIGNOR TO UNION SPECIALMACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FEEDING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Apr. 11, 1916.

Application filed January 17, 1913. Serial No. 742,686.

T 0 all whom it may concern:

Be it known that I, JOSEPH BERGER, Jr., a

citizen of the United States, residing at Utica, in the county ofOneida, State of New York, have invented certain new and usefulImprovements in Feeding Mechanism for Sewing-Machines, of which thefollowing is a description, reference being had to the accompanyingdrawing and to the figures of reference marked thereon. My inventionrelates to feeding mechanism for sewing machines, and particularly to amachine used in sewing a binding strip upon a knitted fabric whenbinding across the wales of the fabric, in which event unless theknittedfabric is fed slightly faster than the binding strip the formeris liable to become stretched or distorted in the stitching operation.

It is sometimes desirable when stitching one piece of fabric to anotherof the above character, to cause the fulling action of the mechanism tocease, as for example, when crossing stay strips and the like. Twodifferent types of differential feeding mecha nism for accomplishingthis result have been devised, one in which the differential feed dog isthrown into unison with the main feed dog when occasion demands, and theother in which the differential feed dog is thrown out of effectivecooperative relation to the fabric; and it is to the latter type ofmachine that the present invention especially relates.

In such a machine, when the forward or auxiliary feed dogis, by thetreadle-controlled mechanism, dropped below the fabric to render itinefi'ective, then the work passing into the machine will not be carriedunderneath the presser foot and up to the needle, for there is noengagement of feed dog ahead of the presser foot withthe goods.

The object of my invention is to over-.

drawings, in which- Figure l is an end view partly in section of aportion of a sewing machine embodying my invention, both feeds beingshown raised, the forward feed being shown in effective position withrespect to cooperation with the rear feed; Fig. 2 is a detail view ofthe feed dogs and means for throwing the forward feed dog into and outof operation; Fig. 3 is a plan view of the feeding mechanism; Fig. 4 isa detail view of the treadle-controlled lever which operates the forwardfeed dog; Fig. 5 is an end view, the forward feed being inactive; Fig. 6is a similar view, showing both dogs raised, and illustrating therelative positions of the main dog extension; Fig. 7 is a side view ofthe parts positioned as in Fig. 5;. and Fig. 8 is a side view of theparts positioned as in Fig. 6.

In these drawings I have shown a portion of a sewing machine of the wellknown Union Special type, the bed plate being shown at 1, the clothplate at 2, the throat plate at 3, needle at 4:, presser bar at 5, mainshaft at 6 and the feed-operating eccentric at The main feed dog isshown at 8 and the auxiliary feed dog at 9. Upon the forward end of theauxiliary feed bar 16 is formed or attached a head 17 having a socket 18formin a seat for a spring 19, attached at one en to the plate or bar20, which carries the feed dog 9. Said bar has also a downwardlyextending flattened. portion 21, dovetailed in a groove 22 in the head17, and projecting through said head is engaged by the forward end of alever 23, pivoted at 24 to an extension 25 of the lug 26 on theauxiliary feed bar, to which lug the pivotal link 27 is attached toimpart the differential movement to the auxiliary feed bar. This leverpartakes of the rising and falling and forward and backward movements ofthe auxiliary feed bar, and the spring 19 keeps the feed dog 9 inposition of normal action at the usual times on the fabric.

It will be noted from the arrangement of parts that when the rear end ofthe lever 23 is raised, the forward end will draw down on the part 21and draw the feed dog '9 out of effective engagement with the fabric,thus causing all the work of feeding to be performed by the main feeddog.

Pivotedat 28 is a lever 29 to which at one end is attached a chain 30,connected to a spring treadle, and the opposite end 32 extends beneaththe rear end of lever 23, so that when the end 32 is raised by drawingdown on the oposite end, it will force up the rear end of lever28, anddraw down feed dog 9. Upon release of lever 29 it will return to normalposition, and allow the spring 19 to return the feed dog 9 to operativeposition.

The parts thus far described are of well known construction, and thepresent invention is designed to overcome the defect heretofore referredto, that when the forward feed dog is dropped down out of the 'way,

there is no feed for the material ahead of the needle to carry the workunderneath the presser foot. To obviate this defect, the feed dog 9 isslotted or cut away at 10, and an extension 11 of the main feed dog isextended over into said s'lot, so that when the dog 9 is dropped toinefi'ective position, the extension 11 will still bear upon thematerial and aid in the feeding action carrying it underneath thepresser foot. The forward feed dog is arranged to rise slightly higherthan the main feed dog, so that when the forward feed dog 9 is hearingon the material, the latter is lifted from the extension, of the mainfeed dog and will not be engaged by said extension. This is shown inFigs. 1, 6 and 8 of the drawing which show the feed dogs both inoperative positions.

It will be understood that minor modifications may be made, withoutdeparting from the spirit of my invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. A sewing machine feeding mechanism including a main feeding device,an auxiliary feeding device, and means for moving the auxiliary feedingdevice to ineffective position without stopping the main feeding device,said main feeding device having a portion extending into the regioncontaining the auxiliary feeding device whereby when the said auxiliaryfeeding device is moved to ineffective position said extension of themain feeding device will engage and feed the fabric.

2. A sewing machine feeding mechanism including a main feed dog, anauxiliary' 1,17s,ess

eration.

4. A sewing machine feeding mechanism including main and auxiliary feeddogs, and means for throwing the latter out of effective action on thefabric, said auxiliary feed dog having a longitudinal opening betweenits toothed surfaces, the main feed dog having a toothed surfaceextending into said opening and engaging the fabric when the auxiliaryfeed dog is thrown out of operation, said extending toothed surface inits working position being-on a lower level than the feeding surface ofthe auxiliary feed dog when the latter is in working position.

A sewing machine feeding mechanism including a main feeding device, anauxiliary feeding device, means for shifting the auxiliary feedingdevice without stopping the movements of the feeding devices to renderthe feeding action thereof ineffective, and a normally inefiectivefabric engaging device for engaging and feeding the fabric in advance ofthe needle when said auxiliary feeding device is rendered ineffective.

6. A sewing machine including in combination a work support, feed dogsarranged side by side, means for giving said feed dogs a differentialmovement, and means whereby said feed dogs are alternately rendered effective and ineffective without stopping the feed dogs.

7. A sewing machine including in combination a work, support, feed dogslocated beneath the work support and projecting through the same toengage the fabric, said feed dogs having fabric-engaging'surfacesarranged side by side, means for giving the feed dogs a differentialfeeding movement, and means for changing the relative heights of thefeed dogs when in raised position and without stopping the movements ofthe feed (logs whereby first one feed dog and then the other is renderedeffective to engage and feed the fabric.

8. A sewing machine including in combination a work support, a feedingmechanism having a fabric-engaging surface in rear of the needle, andfabric-engaging surfaces in advance of the needle, said fabricengagingsurfaces in advance of the needle being given a differential movementrelative to each other, and means for varying the relative heights ofthe feed engaging sur- In testimony whereof I afiix my signature facesWhen in raised position in advance of in the presence of two Witnesses.the needle and without stopping the move- JOSEPH BERGER, JR. ments ofthe feed engaging surfaces whereby Witnesses:

5 first one feed engaging surface and then the CHAS. B. MAsoN,

other is-rendered effective to feed the fabric. A. DQELDRED.

